Amateur radio : how and why of wireless with complete instructions on operation of receiving outfits (1922)
Grainger, Maurice J · New York : James A. McCann · leaf 114
e. The beat note is ob-tained by throwing the heterodyne slightlyabove or below the signal it is desired to re-ceive. Both circuits should be calibrated foreasy manipulation. As this method of recep-tion is designed for long waves, honeycombcoils or other good compact inductances arerecommended.… … TelephonesAmplifier Vacuum. Iv&<? Separate Hef-rodyne.oscillator 2 2A Vo/fs Fig. 12Receiving Circuit Showing Separate Heterodyne.
Radio · Amateur radio stations
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